Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9c9d5f302ff644…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 23:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a340d55c5d0b24a7dcab1df1c2ef2eb SHA-1: 9cc77aad9c090b46bc312e6f53350d8a3d7fcc7f SHA-256: ce9c9d5f302ff64413f8bf23d2747c4cfdc89f5b1553f3c3139eccf034919fb5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing payload or exploit. The embedded JavaScript is a primary vector for executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://peetersinstallatietechniek.nl/upload/files/ninenajanopuxef.pdf In PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/51031077556.pdfIn PDF document text
    • https://31app.com/userfiles/file/litobuliso.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/ripuzibagopujotisa.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/16235219924.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/powafim.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/ruwulezideji.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/30001539553.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/xokikukanudebatilanuzaru.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/leninazotusafeponexoz.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/jixazamidimemifupiz.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/siletibabek.pdfIn PDF document text
    • https://dacola.com/upload/files/nevujapepivifilufagira.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a366a3cf16---dunonaxagi.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/26972902101.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/92721210790.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090907514573499.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/patibazifomup.pdfIn PDF document text
    • http://meta-min.com/files/nimosorelig.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/60627494903.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/12621721555.pdfIn PDF document text
    • https://mklaassen.nl/images/file/walivadiwabuwinozufofiso.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/dovumupubukesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=watch+fast+and+furious+online+free+putlockerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 10900 bytes
SHA-256: fe93a551160a88c8e776cad7f8c5c94bb773162bc7e151bb24fa352b5f957d03
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 18460 bytes
SHA-256: c0f781ba48882b6d10b67414858ddeec93e8f804f7c26900d4d25c37638e6f8d
font_02_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1